<!-- 上传弹窗 -->
<template>
  <div class="upload-container">
    <el-button
      :style="{ background:color, borderColor:color}"
      icon="el-icon-upload"
      size="mini"
      type="primary"
      @click=" dialogVisible=true"
    >
      上传
    </el-button>
    <el-dialog :visible.sync="dialogVisible">
      <el-upload
        multiple
        :file-list="fileList"
        :on-remove="handleRemove"
        :on-success="handleSuccess"
        :before-upload="beforeUpload"
        class="editor-slide-upload"
        :action="actionUrl"
        :headers="head"
        list-type="picture-card"
      >
        <el-button size="small" type="primary">点击上传</el-button>
      </el-upload>
      <el-button @click="dialogVisible = false">取消</el-button>
      <el-button type="primary" @click="handleSubmit">确定</el-button>
    </el-dialog>
  </div>
</template>
<script>

export default {
  name: 'EditorSlideUpload',
  props: {
    color: {
      type: String,
      default: '#1890ff'
    }
  },
  data() {
    return {
      dialogVisible: false,
      listObj: {},
      fileList: [],
      actionUrl: window.api.uploadUrl1 + `?path=appliance`,
      head: {
        userRole: "ADMIN",
        token: window.sessionStorage.getItem("token")
      },
    }
  },
  methods: {
    // 检查图片是否全部上传成成
    checkAllSuccess() {
      return Object.keys(this.listObj).every(item => this.listObj[item].hasSuccess)
    },

    handleSubmit() {
      const arr = Object.keys(this.listObj).map(v => this.listObj[v])
      if (!this.checkAllSuccess()) {
        return this.$message('请等待所有图片上传成功。如果是网络问题，请刷新页面重新上传！')
      }
      this.$emit('success', arr)
      this.listObj = {}
      this.fileList = []
      this.dialogVisible = false
    },

    // 上传成功回调
    handleSuccess(response, file) {
      const uid = file.uid
      const objKeyArr = Object.keys(this.listObj)
      for (let i = 0, len = objKeyArr.length; i < len; i++) {
        if (this.listObj[objKeyArr[i]].uid === uid) {
          this.listObj[objKeyArr[i]].url = response.value
          this.listObj[objKeyArr[i]].hasSuccess = true
          return
        }
      }
    },

    // 移除图片回调
    handleRemove(file) {
      const uid = file.uid
      const objKeyArr = Object.keys(this.listObj)
      for (let i = 0, len = objKeyArr.length; i < len; i++) {
        if (this.listObj[objKeyArr[i]].uid === uid) {
          delete this.listObj[objKeyArr[i]]
          return
        }
      }
    },

    beforeUpload(file) {
      const _self = this
      const _URL = window.URL || window.webkitURL
      const fileName = file.uid
      this.listObj[fileName] = {}
      return new Promise((resolve, reject) => {
        const img = new Image()
        img.src = _URL.createObjectURL(file)
        img.onload = function() {
          _self.listObj[fileName] = { hasSuccess: false, uid: file.uid, width: this.width, height: this.height }
        }
        resolve(true)
      })
    }
  }
}
</script>

<style scoped lang="scss">
  .editor-slide-upload {
    margin-bottom: 20px;

    ::v-deep .el-upload--picture-card {
      width: 100%;
    }
  }
</style>
